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Subway Stations Retaining Walls: Case Histories in Soft and Hard Soils

Oscar Vardé and Alejo Sfriso
Thursday, April 27, 2017
First presented: 
Third International Conference on Deep Foundations (Santa Cruz, Bolivia).
Published paper

In the last twenty years, sixteen pile-supported metro stations have been built in Buenos Aires in a wide range of geotechnical conditions. After an initial design of the construction procedures including partial open-trench (in two cases), all subsequent fourteen stations were excavated employing cut&cover techniques. In all cases, vertical bored piles were employed both to support the lateral ground pressure and the loads acting on the roof slab. This paper revisits the geotechnical conditions in Buenos Aires City, describes the procedures employed for the design and numerical analysis of pile-supported excavations and presents the behavior of five recent cases located in widely different geotechnical profiles. The paper ends with a summary of lessons learned which are relevant both for design and construction.

Feature Author

Alejo Oscar Sfriso

Alejo O. Sfriso is a Principal Engineer with 25 years of experience in geotechnical engineering for infrastructure and mining works. He is an expert in the application of numerical methods for geotechnical design and analysis. In addition to his activity at SRK, he is the Director of AOSA - Geotechnical Laboratory, Professor of Soil Mechanics and Geology of the University of Buenos Aires, Vice President for South America of the International Society of Soil Mechanics and Geotechnical Engineering for the period 2017 - 2021, former Professor of Geotechnics at the National University of La Plata and former President of the Argentinean Society of Geotechnical Engineering.

Principal Consultant
PhD, Civil Engineer
SRK Buenos Aires
SRK North America